<template>
  <div>
    <el-upload action="https://jsonplaceholder.typicode.com/posts/" :data="dataObj" list-type="picture" :multiple="false" :show-file-list="showFileList" :file-list="fileList" :before-upload="beforeUpload" :on-remove="handleRemove" :on-success="handleUploadSuccess" :on-preview="handlePreview">
      <el-button size="small" type="primary">点击上传</el-button>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="fileList[0].url" alt="">
    </el-dialog>
  </div>
</template>
<script>
import { policy } from "@/api/oss";

export default {
  name: "singleUpload",
  props: {
    value: String
  },
  computed: {
    imageUrl() {
      return this.value;
    },
    imageName() {
      if (this.value != null && this.value !== "") {
        return this.value.substr(this.value.lastIndexOf("/") + 1);
      } else {
        return null;
      }
    },
    fileList() {
      return [
        {
          name: this.imageName,
          url: this.imageUrl
        }
      ];
    },
    showFileList: {
      get: function() {
        return (
          this.value !== null && this.value !== "" && this.value !== undefined
        );
      },
      set: function(newValue) {}
    }
  },
  data() {
    return {
      dataObj: {
        policy: "",
        signature: "",
        key: "",
        ossaccessKeyId: "",
        dir: "",
        host: ""
        // callback:'',
      },
      dialogVisible: false
    };
  },
  methods: {
    emitInput(val) {
      this.$emit("input", val);
    },
    handleRemove(file, fileList) {
      this.emitInput("");
    },
    handlePreview(file) {
      this.dialogVisible = true;
    },
    beforeUpload(file) {
      console.log(file);
      let _self = this;
      // return new Promise((resolve, reject) => {
      policy(_self).then(response => {
        // _self.dataObj.policy = response.data.policy;
        // _self.dataObj.signature = response.data.signature;
        // _self.dataObj.ossaccessKeyId = response.data.accessKeyId;
        // _self.dataObj.key = response.data.dir + "/${filename}";
        // _self.dataObj.dir = response.data.dir;
        // _self.dataObj.host = response.data.host;
        // _self.dataObj.callback = response.data.callback;
        this.$message({
          type: "success",
          message: "上传成功!"
        });
        resolve(true);
      });

      // .catch(err => {
      //   console.log(err);
      //   reject(false);
      // });
      // });
    },
    handleUploadSuccess(res, file) {
      this.showFileList = true;
      this.fileList.pop();
      this.fileList.push({
        name: file.name,
        url: this.dataObj.host + "/" + this.dataObj.dir + "/" + file.name
      });
      this.emitInput(this.fileList[0].url);
    }
  }
};
</script>
<style>
</style>


